MnO2/nitrogen-doped activated carbon composite material, and preparation method and application thereof
A composite material and activated carbon technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of low specific capacitance and energy density, poor cycle stability, etc., achieve high specific capacitance and energy density, and ensure fast Metastasis, effect of multiple active sites
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Embodiment 1
[0039] This embodiment provides a kind of MnO for supercapacitor 2 The preparation method of / nitrogen-doped active carbon composite material, comprises the steps:
[0040] Put the anthracite block into a pulverizer for crushing, then pass through a 200-mesh sieve, and put it in an oven at 110°C for 24 hours to obtain dry coal powder;
[0041] Take 10g of dry coal powder and place it in a beaker filled with 100mL of hydrofluoric acid aqueous solution with a mass concentration of 40%, and heat it in a water bath at 60°C for 6h to obtain the first suspension; Suction filtration, washing with deionized water until the pH of the filtrate is 7, and putting the obtained filter cake in a vacuum drying oven at 80°C for 24 hours to obtain ash-free coal;
[0042] Weigh 1g of ash-free coal, 1g of urea, and 4g of potassium hydroxide, place them in a mortar, grind them into powder and mix them evenly, put them in a porcelain boat and place them in a horizontal tube furnace, and put N 2 , ...
Embodiment 2
[0052] This embodiment provides a kind of MnO for supercapacitor 2 The preparation method of / nitrogen-doped active carbon composite material, comprises the steps:
[0053] Put the anthracite block into a pulverizer for crushing, then pass through a 180-mesh sieve, and put it in a 120°C oven to dry for 22 hours to obtain dry coal powder;
[0054] Take 10g of dry coal powder and place it in a beaker filled with 80mL of hydrofluoric acid aqueous solution with a mass concentration of 50%, and heat it in a water bath at 70°C for 5h to obtain the first suspension; Suction filtration, washing with deionized water until the pH of the filtrate is 7, and putting the obtained filter cake into a vacuum drying oven at 90°C for 20 hours to obtain ash-free coal;
[0055] Weigh 1g of ash-free coal, 0.5g of urea and 3g of potassium hydroxide, place them in a mortar, grind them into powder and mix them evenly, put them in a porcelain boat and place them in a horizontal tube furnace, and put N ...
Embodiment 3
[0060] This embodiment provides a kind of MnO for supercapacitor 2 The preparation method of / nitrogen-doped active carbon composite material, comprises the steps:
[0061] Put the anthracite block into a pulverizer for crushing, then pass through a 220-mesh sieve, and put it in a 100°C oven to dry for 24 hours to obtain dry coal powder;
[0062] Take 10g of dry coal powder and place it in a beaker filled with 120mL of hydrofluoric acid aqueous solution with a mass concentration of 30%, and heat it in a water bath at 50°C for 7h to obtain the first suspension; Suction filtration, washing with deionized water until the pH of the filtrate is 7, and putting the obtained filter cake into a vacuum drying oven at 70°C for 28 hours to obtain ash-free coal;
[0063] Weigh 1g of ash-free coal, 2g of urea and 5g of potassium hydroxide, place them in a mortar, grind them into powder and mix them evenly, put them into a porcelain boat and place them in a horizontal tube furnace, and put t...
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